Hi, For the pass 0 data using the current ECAL code in the trunk, you should sort the “IC” cluster hits with the following method. ClusterUtilities.sortReconClusterHits(List<Cluster> clusters); Then the first hit in each cluster’s list will be the seed hit e.g. the hit with the highest energy. —Jeremy ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1